Improper access control in Ultimate Member – User Profile & Membership Plugin for WordPress

1) Improper access control

EUVDB-ID: #VU24502

Risk: Medium

CVSSv3.1: 4.6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-6859

CWE-ID: CWE-284 - Improper Access Control

Exploit availability: No

Description

The vulnerability allows a remote attacker to gain unauthorized access to otherwise restricted functionality.

The vulnerability exists due to Insecure Direct Object Reference (IDOR) issue in includes/core/class-files.php. A remote attacker can bypass implemented security restrictions and change other users' profiles and cover photos via a modified "user_id" parameter. This is related to "ajax_image_upload" and "ajax_resize_image".

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Mitigation

Install updates from vendor's website.

Vulnerable software versions

Ultimate Member – User Profile & Membership Plugin: 1.0.0 - 2.1.2

External links

http://github.com/ultimatemember/ultimatemember/blob/627bbb0fae81ac34c60b43f0867eadcf8e1bc523/includes/core/class-files.php#L269
http://github.com/ultimatemember/ultimatemember/blob/627bbb0fae81ac34c60b43f0867eadcf8e1bc523/includes/core/class-files.php#L310
http://github.com/ultimatemember/ultimatemember/commit/249682559012734a4f7d71f52609b2f301ea55b1
http://wordpress.org/plugins/ultimate-member/#developers
http://wpvulndb.com/vulnerabilities/10041

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.